[Jeremy Garchow]"The generators in FCP7 are generators, meaning they will generate at whatever bit depth the timeline is set to and rendered."
That's absolutely wrong.

Can you tell me any Graphic application working in YUV?
FCP graphics are generated in 8b RGB, then are converted to the Color Space and bit-deapth of the sequence.
Whatever those setting what you get is converted 8bRGB.

[Jeremy Garchow]" I don't know why you never believe me on these points. You seem to think FCP7 is stuck on 8b RGB when it's not. Some of it is (in RGB rendering, and RT previews) but most of it is not."
This is boring Jeremy.This has been discussed thousand time.

FC can't render but 8b when in RGB.
10b RGB stuff will be converted and rendered in10b YUV; then the 10b YUV converted again to 10bRGB on exporting.

You can preserve the 10b, but you can't keep all the pipeline RGB.

The only problem is letting FC to do that conversion.
Cineform, GlueTools, etc, use their own engine, as the guy of Cineform (Michael Newman) explained here.
rafael